納米二氧化鈦光催化劑的制備及其光催化性能研究.pdf

1、天津大學(xué)碩士學(xué)位論文納米二氧化鈦光催化劑的制備及其光催化性能研究姓名：方世杰申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：材料學(xué)指導(dǎo)教師：徐明霞2001.12.1一一—坐唑L—————一——AbstractInthisarticlenanometertitaniaphotocatalysiswaspreparedbyInorganicsalthydrolyzemethodandwasannealedatdifferenttemperatureNanomete

2、rTi02powderswereobtainedfromTiOS04andstudiedbylCpTG—DTA，XRD，TEMandBETTheresultindicatedthatpHheattreatmenttemperaturehavegreateflectsongramSiZeandcrystalphasestructureAnnealedat500℃，nanometerTie2withspecificstlrfacearea1

3、0139m2g?！產(chǎn)ndgrainsizeabout10nmwereobtained(pH=5)；andwithspecificsurfacearea9548m2一andgrainsizeabout30ntowereobtained(pH=10)Theresearchindicatedthatcrystalphasetransformationoffutileat750℃madegreatprogressingrainsizegrowt

4、hResearchdirectioninthisarticlewassupportedphotocatalystSupportedmethodofphotocatalystplayedakeyroleonphotocatalyticperformanceHydrolysisfilming、suspendliquiddepositionandadhesivemethodwereinvestigated，andlifeofsupported

5、photocatalystpreparedbyadhesivemethodandphotocatalyticconditionwerealsoinvestigatedInTie2photocatalysis，themechanismcontaminantshasbeenstudiedextensivelyofthephotocatalyticoxidationoforganicUltraviolet(UV)illuminationwit

6、hradiation(^380nm)ofenergyhigherthanthebandgapenergyofTi02(E。望32eVforanatasephase)includeselectronandholeformationontheconductionandvalencebandsofthesemiconductor，respectivelyThesechargecarrierspeciescanrecombine，releasi

7、ngtheabsorbedenergyasheat，orundergointerracialtransporttothesurfaceTheholesarepowerfuloxidants，whichcandirectlyorindirectlyoxidizemostorganiccompoundsInthepresenceofwater，hydroxylradical(OH)formationOccursonthesemiconduc

8、torsurfaceduetoheletrappingbyinterfaciaIelectrontransferBothhydroxvJradicalattackandholeoxidationhavebeenshowntobetheprimarypathways‰theoxidationreactionSupportednanometerTi02photocatalystwereimmobilized、mglasseswithadhe

9、sivebondingmethod，andtheeffectfactoroftheactivityofphotocatalysiswasinvestigatedTheabilityformulaofphotoc砒aIystjcoxidationwasgiveninqualitative：E，彳(五)^(哎)工(J)Atlast，dopedTie!photocatalystwaselementaryinvestigated、andthea